fs/f2fs/sysfs.c

   1 /*
   2  * f2fs sysfs interface
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  * Copyright (c) 2017 Chao Yu <chao@kernel.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #include <linux/compiler.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/f2fs_fs.h>
  15 #include <linux/seq_file.h>
  16
  17 #include "f2fs.h"
  18 #include "segment.h"
  19 #include "gc.h"
  20
  21 static struct proc_dir_entry *f2fs_proc_root;
  22
  23 /* Sysfs support for f2fs */
  24 enum {
  25         GC_THREAD,      /* struct f2fs_gc_thread */
  26         SM_INFO,        /* struct f2fs_sm_info */
  27         DCC_INFO,       /* struct discard_cmd_control */
  28         NM_INFO,        /* struct f2fs_nm_info */
  29         F2FS_SBI,       /* struct f2fs_sb_info */
  30 #ifdef CONFIG_F2FS_FAULT_INJECTION
  31         FAULT_INFO_RATE,        /* struct f2fs_fault_info */
  32         FAULT_INFO_TYPE,        /* struct f2fs_fault_info */
  33 #endif
  34         RESERVED_BLOCKS,
  35 };
  36
  37 struct f2fs_attr {
  38         struct attribute attr;
  39         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
  40         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
  41                          const char *, size_t);
  42         int struct_type;
  43         int offset;
  44         int id;
  45 };
  46
  47 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
  48 {
  49         if (struct_type == GC_THREAD)
  50                 return (unsigned char *)sbi->gc_thread;
  51         else if (struct_type == SM_INFO)
  52                 return (unsigned char *)SM_I(sbi);
  53         else if (struct_type == DCC_INFO)
  54                 return (unsigned char *)SM_I(sbi)->dcc_info;
  55         else if (struct_type == NM_INFO)
  56                 return (unsigned char *)NM_I(sbi);
  57         else if (struct_type == F2FS_SBI || struct_type == RESERVED_BLOCKS)
  58                 return (unsigned char *)sbi;
  59 #ifdef CONFIG_F2FS_FAULT_INJECTION
  60         else if (struct_type == FAULT_INFO_RATE ||
  61                                         struct_type == FAULT_INFO_TYPE)
  62                 return (unsigned char *)&sbi->fault_info;
  63 #endif
  64         return NULL;
  65 }
  66
  67 static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
  68                 struct f2fs_sb_info *sbi, char *buf)
  69 {
  70         struct super_block *sb = sbi->sb;
  71
  72         if (!sb->s_bdev->bd_part)
  73                 return snprintf(buf, PAGE_SIZE, "0\n");
  74
  75         return snprintf(buf, PAGE_SIZE, "%llu\n",
  76                 (unsigned long long)(sbi->kbytes_written +
  77                         BD_PART_WRITTEN(sbi)));
  78 }
  79
  80 static ssize_t features_show(struct f2fs_attr *a,
  81                 struct f2fs_sb_info *sbi, char *buf)
  82 {
  83         struct super_block *sb = sbi->sb;
  84         int len = 0;
  85
  86         if (!sb->s_bdev->bd_part)
  87                 return snprintf(buf, PAGE_SIZE, "0\n");
  88
  89         if (f2fs_sb_has_crypto(sb))
  90                 len += snprintf(buf, PAGE_SIZE - len, "%s",
  91                                                 "encryption");
  92         if (f2fs_sb_mounted_blkzoned(sb))
  93                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  94                                 len ? ", " : "", "blkzoned");
  95         if (f2fs_sb_has_extra_attr(sb))
  96                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  97                                 len ? ", " : "", "extra_attr");
  98         if (f2fs_sb_has_project_quota(sb))
  99                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
 100                                 len ? ", " : "", "projquota");
 101         if (f2fs_sb_has_inode_chksum(sb))
 102                 len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
 103                                 len ? ", " : "", "inode_checksum");
 104         len += snprintf(buf + len, PAGE_SIZE - len, "\n");
 105         return len;
 106 }
 107
 108 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 109                         struct f2fs_sb_info *sbi, char *buf)
 110 {
 111         unsigned char *ptr = NULL;
 112         unsigned int *ui;
 113
 114         ptr = __struct_ptr(sbi, a->struct_type);
 115         if (!ptr)
 116                 return -EINVAL;
 117
 118         ui = (unsigned int *)(ptr + a->offset);
 119
 120         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 121 }
 122
 123 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 124                         struct f2fs_sb_info *sbi,
 125                         const char *buf, size_t count)
 126 {
 127         unsigned char *ptr;
 128         unsigned long t;
 129         unsigned int *ui;
 130         ssize_t ret;
 131
 132         ptr = __struct_ptr(sbi, a->struct_type);
 133         if (!ptr)
 134                 return -EINVAL;
 135
 136         ui = (unsigned int *)(ptr + a->offset);
 137
 138         ret = kstrtoul(skip_spaces(buf), 0, &t);
 139         if (ret < 0)
 140                 return ret;
 141 #ifdef CONFIG_F2FS_FAULT_INJECTION
 142         if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
 143                 return -EINVAL;
 144 #endif
 145         if (a->struct_type == RESERVED_BLOCKS) {
 146                 spin_lock(&sbi->stat_lock);
 147                 if ((unsigned long)sbi->total_valid_block_count + t >
 148                                 (unsigned long)sbi->user_block_count) {
 149                         spin_unlock(&sbi->stat_lock);
 150                         return -EINVAL;
 151                 }
 152                 *ui = t;
 153                 spin_unlock(&sbi->stat_lock);
 154                 return count;
 155         }
 156
 157         if (!strcmp(a->attr.name, "discard_granularity")) {
 158                 struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
 159                 int i;
 160
 161                 if (t == 0 || t > MAX_PLIST_NUM)
 162                         return -EINVAL;
 163                 if (t == *ui)
 164                         return count;
 165
 166                 mutex_lock(&dcc->cmd_lock);
 167                 for (i = 0; i < MAX_PLIST_NUM; i++) {
 168                         if (i >= t - 1)
 169                                 dcc->pend_list_tag[i] |= P_ACTIVE;
 170                         else
 171                                 dcc->pend_list_tag[i] &= (~P_ACTIVE);
 172                 }
 173                 mutex_unlock(&dcc->cmd_lock);
 174
 175                 *ui = t;
 176                 return count;
 177         }
 178
 179         *ui = t;
 180
 181         if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0)
 182                 f2fs_reset_iostat(sbi);
 183         if (!strcmp(a->attr.name, "gc_urgent") && t == 1 && sbi->gc_thread) {
 184                 sbi->gc_thread->gc_wake = 1;
 185                 wake_up_interruptible_all(&sbi->gc_thread->gc_wait_queue_head);
 186                 wake_up_discard_thread(sbi, true);
 187         }
 188
 189         return count;
 190 }
 191
 192 static ssize_t f2fs_attr_show(struct kobject *kobj,
 193                                 struct attribute *attr, char *buf)
 194 {
 195         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 196                                                                 s_kobj);
 197         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 198
 199         return a->show ? a->show(a, sbi, buf) : 0;
 200 }
 201
 202 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 203                                                 const char *buf, size_t len)
 204 {
 205         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 206                                                                         s_kobj);
 207         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 208
 209         return a->store ? a->store(a, sbi, buf, len) : 0;
 210 }
 211
 212 static void f2fs_sb_release(struct kobject *kobj)
 213 {
 214         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 215                                                                 s_kobj);
 216         complete(&sbi->s_kobj_unregister);
 217 }
 218
 219 enum feat_id {
 220         FEAT_CRYPTO = 0,
 221         FEAT_BLKZONED,
 222         FEAT_ATOMIC_WRITE,
 223         FEAT_EXTRA_ATTR,
 224         FEAT_PROJECT_QUOTA,
 225         FEAT_INODE_CHECKSUM,
 226 };
 227
 228 static ssize_t f2fs_feature_show(struct f2fs_attr *a,
 229                 struct f2fs_sb_info *sbi, char *buf)
 230 {
 231         switch (a->id) {
 232         case FEAT_CRYPTO:
 233         case FEAT_BLKZONED:
 234         case FEAT_ATOMIC_WRITE:
 235         case FEAT_EXTRA_ATTR:
 236         case FEAT_PROJECT_QUOTA:
 237         case FEAT_INODE_CHECKSUM:
 238                 return snprintf(buf, PAGE_SIZE, "supported\n");
 239         }
 240         return 0;
 241 }
 242
 243 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 244 static struct f2fs_attr f2fs_attr_##_name = {                   \
 245         .attr = {.name = __stringify(_name), .mode = _mode },   \
 246         .show   = _show,                                        \
 247         .store  = _store,                                       \
 248         .struct_type = _struct_type,                            \
 249         .offset = _offset                                       \
 250 }
 251
 252 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 253         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 254                 f2fs_sbi_show, f2fs_sbi_store,                  \
 255                 offsetof(struct struct_name, elname))
 256
 257 #define F2FS_GENERAL_RO_ATTR(name) \
 258 static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)
 259
 260 #define F2FS_FEATURE_RO_ATTR(_name, _id)                        \
 261 static struct f2fs_attr f2fs_attr_##_name = {                   \
 262         .attr = {.name = __stringify(_name), .mode = 0444 },    \
 263         .show   = f2fs_feature_show,                            \
 264         .id     = _id,                                          \
 265 }
 266
 267 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent_sleep_time,
 268                                                         urgent_sleep_time);
 269 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 270 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 271 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 272 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 273 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent, gc_urgent);
 274 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 275 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
 276 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);
 277 F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
 278 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 279 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 280 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 281 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 282 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);
 283 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 284 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
 285 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
 286 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 287 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 288 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
 289 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
 290 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
 291 #ifdef CONFIG_F2FS_FAULT_INJECTION
 292 F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
 293 F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
 294 #endif
 295 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
 296 F2FS_GENERAL_RO_ATTR(features);
 297
 298 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 299 F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO);
 300 #endif
 301 #ifdef CONFIG_BLK_DEV_ZONED
 302 F2FS_FEATURE_RO_ATTR(block_zoned, FEAT_BLKZONED);
 303 #endif
 304 F2FS_FEATURE_RO_ATTR(atomic_write, FEAT_ATOMIC_WRITE);
 305 F2FS_FEATURE_RO_ATTR(extra_attr, FEAT_EXTRA_ATTR);
 306 F2FS_FEATURE_RO_ATTR(project_quota, FEAT_PROJECT_QUOTA);
 307 F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM);
 308
 309 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 310 static struct attribute *f2fs_attrs[] = {
 311         ATTR_LIST(gc_urgent_sleep_time),
 312         ATTR_LIST(gc_min_sleep_time),
 313         ATTR_LIST(gc_max_sleep_time),
 314         ATTR_LIST(gc_no_gc_sleep_time),
 315         ATTR_LIST(gc_idle),
 316         ATTR_LIST(gc_urgent),
 317         ATTR_LIST(reclaim_segments),
 318         ATTR_LIST(max_small_discards),
 319         ATTR_LIST(discard_granularity),
 320         ATTR_LIST(batched_trim_sections),
 321         ATTR_LIST(ipu_policy),
 322         ATTR_LIST(min_ipu_util),
 323         ATTR_LIST(min_fsync_blocks),
 324         ATTR_LIST(min_hot_blocks),
 325         ATTR_LIST(max_victim_search),
 326         ATTR_LIST(dir_level),
 327         ATTR_LIST(ram_thresh),
 328         ATTR_LIST(ra_nid_pages),
 329         ATTR_LIST(dirty_nats_ratio),
 330         ATTR_LIST(cp_interval),
 331         ATTR_LIST(idle_interval),
 332         ATTR_LIST(iostat_enable),
 333 #ifdef CONFIG_F2FS_FAULT_INJECTION
 334         ATTR_LIST(inject_rate),
 335         ATTR_LIST(inject_type),
 336 #endif
 337         ATTR_LIST(lifetime_write_kbytes),
 338         ATTR_LIST(features),
 339         ATTR_LIST(reserved_blocks),
 340         NULL,
 341 };
 342
 343 static struct attribute *f2fs_feat_attrs[] = {
 344 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 345         ATTR_LIST(encryption),
 346 #endif
 347 #ifdef CONFIG_BLK_DEV_ZONED
 348         ATTR_LIST(block_zoned),
 349 #endif
 350         ATTR_LIST(atomic_write),
 351         ATTR_LIST(extra_attr),
 352         ATTR_LIST(project_quota),
 353         ATTR_LIST(inode_checksum),
 354         NULL,
 355 };
 356
 357 static const struct sysfs_ops f2fs_attr_ops = {
 358         .show   = f2fs_attr_show,
 359         .store  = f2fs_attr_store,
 360 };
 361
 362 static struct kobj_type f2fs_sb_ktype = {
 363         .default_attrs  = f2fs_attrs,
 364         .sysfs_ops      = &f2fs_attr_ops,
 365         .release        = f2fs_sb_release,
 366 };
 367
 368 static struct kobj_type f2fs_ktype = {
 369         .sysfs_ops      = &f2fs_attr_ops,
 370 };
 371
 372 static struct kset f2fs_kset = {
 373         .kobj   = {.ktype = &f2fs_ktype},
 374 };
 375
 376 static struct kobj_type f2fs_feat_ktype = {
 377         .default_attrs  = f2fs_feat_attrs,
 378         .sysfs_ops      = &f2fs_attr_ops,
 379 };
 380
 381 static struct kobject f2fs_feat = {
 382         .kset   = &f2fs_kset,
 383 };
 384
 385 static int __maybe_unused segment_info_seq_show(struct seq_file *seq,
 386                                                 void *offset)
 387 {
 388         struct super_block *sb = seq->private;
 389         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 390         unsigned int total_segs =
 391                         le32_to_cpu(sbi->raw_super->segment_count_main);
 392         int i;
 393
 394         seq_puts(seq, "format: segment_type|valid_blocks\n"
 395                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 396
 397         for (i = 0; i < total_segs; i++) {
 398                 struct seg_entry *se = get_seg_entry(sbi, i);
 399
 400                 if ((i % 10) == 0)
 401                         seq_printf(seq, "%-10d", i);
 402                 seq_printf(seq, "%d|%-3u", se->type,
 403                                         get_valid_blocks(sbi, i, false));
 404                 if ((i % 10) == 9 || i == (total_segs - 1))
 405                         seq_putc(seq, '\n');
 406                 else
 407                         seq_putc(seq, ' ');
 408         }
 409
 410         return 0;
 411 }
 412
 413 static int __maybe_unused segment_bits_seq_show(struct seq_file *seq,
 414                                                 void *offset)
 415 {
 416         struct super_block *sb = seq->private;
 417         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 418         unsigned int total_segs =
 419                         le32_to_cpu(sbi->raw_super->segment_count_main);
 420         int i, j;
 421
 422         seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
 423                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 424
 425         for (i = 0; i < total_segs; i++) {
 426                 struct seg_entry *se = get_seg_entry(sbi, i);
 427
 428                 seq_printf(seq, "%-10d", i);
 429                 seq_printf(seq, "%d|%-3u|", se->type,
 430                                         get_valid_blocks(sbi, i, false));
 431                 for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
 432                         seq_printf(seq, " %.2x", se->cur_valid_map[j]);
 433                 seq_putc(seq, '\n');
 434         }
 435         return 0;
 436 }
 437
 438 static int __maybe_unused iostat_info_seq_show(struct seq_file *seq,
 439                                                void *offset)
 440 {
 441         struct super_block *sb = seq->private;
 442         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 443         time64_t now = ktime_get_real_seconds();
 444
 445         if (!sbi->iostat_enable)
 446                 return 0;
 447
 448         seq_printf(seq, "time:          %-16llu\n", now);
 449
 450         /* print app IOs */
 451         seq_printf(seq, "app buffered:  %-16llu\n",
 452                                 sbi->write_iostat[APP_BUFFERED_IO]);
 453         seq_printf(seq, "app direct:    %-16llu\n",
 454                                 sbi->write_iostat[APP_DIRECT_IO]);
 455         seq_printf(seq, "app mapped:    %-16llu\n",
 456                                 sbi->write_iostat[APP_MAPPED_IO]);
 457
 458         /* print fs IOs */
 459         seq_printf(seq, "fs data:       %-16llu\n",
 460                                 sbi->write_iostat[FS_DATA_IO]);
 461         seq_printf(seq, "fs node:       %-16llu\n",
 462                                 sbi->write_iostat[FS_NODE_IO]);
 463         seq_printf(seq, "fs meta:       %-16llu\n",
 464                                 sbi->write_iostat[FS_META_IO]);
 465         seq_printf(seq, "fs gc data:    %-16llu\n",
 466                                 sbi->write_iostat[FS_GC_DATA_IO]);
 467         seq_printf(seq, "fs gc node:    %-16llu\n",
 468                                 sbi->write_iostat[FS_GC_NODE_IO]);
 469         seq_printf(seq, "fs cp data:    %-16llu\n",
 470                                 sbi->write_iostat[FS_CP_DATA_IO]);
 471         seq_printf(seq, "fs cp node:    %-16llu\n",
 472                                 sbi->write_iostat[FS_CP_NODE_IO]);
 473         seq_printf(seq, "fs cp meta:    %-16llu\n",
 474                                 sbi->write_iostat[FS_CP_META_IO]);
 475         seq_printf(seq, "fs discard:    %-16llu\n",
 476                                 sbi->write_iostat[FS_DISCARD]);
 477
 478         return 0;
 479 }
 480
 481 #define F2FS_PROC_FILE_DEF(_name)                                       \
 482 static int _name##_open_fs(struct inode *inode, struct file *file)      \
 483 {                                                                       \
 484         return single_open(file, _name##_seq_show, PDE_DATA(inode));    \
 485 }                                                                       \
 486                                                                         \
 487 static const struct file_operations f2fs_seq_##_name##_fops = {         \
 488         .open = _name##_open_fs,                                        \
 489         .read = seq_read,                                               \
 490         .llseek = seq_lseek,                                            \
 491         .release = single_release,                                      \
 492 };
 493
 494 F2FS_PROC_FILE_DEF(segment_info);
 495 F2FS_PROC_FILE_DEF(segment_bits);
 496 F2FS_PROC_FILE_DEF(iostat_info);
 497
 498 int __init f2fs_init_sysfs(void)
 499 {
 500         int ret;
 501
 502         kobject_set_name(&f2fs_kset.kobj, "f2fs");
 503         f2fs_kset.kobj.parent = fs_kobj;
 504         ret = kset_register(&f2fs_kset);
 505         if (ret)
 506                 return ret;
 507
 508         ret = kobject_init_and_add(&f2fs_feat, &f2fs_feat_ktype,
 509                                    NULL, "features");
 510         if (ret) {
 511                 kobject_put(&f2fs_feat);
 512                 kset_unregister(&f2fs_kset);
 513         } else {
 514                 f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
 515         }
 516         return ret;
 517 }
 518
 519 void f2fs_exit_sysfs(void)
 520 {
 521         kobject_put(&f2fs_feat);
 522         kset_unregister(&f2fs_kset);
 523         remove_proc_entry("fs/f2fs", NULL);
 524         f2fs_proc_root = NULL;
 525 }
 526
 527 int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
 528 {
 529         struct super_block *sb = sbi->sb;
 530         int err;
 531
 532         sbi->s_kobj.kset = &f2fs_kset;
 533         init_completion(&sbi->s_kobj_unregister);
 534         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL,
 535                                 "%s", sb->s_id);
 536         if (err) {
 537                 kobject_put(&sbi->s_kobj);
 538                 wait_for_completion(&sbi->s_kobj_unregister);
 539                 return err;
 540         }
 541
 542         if (f2fs_proc_root)
 543                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
 544
 545         if (sbi->s_proc) {
 546                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
 547                                  &f2fs_seq_segment_info_fops, sb);
 548                 proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
 549                                  &f2fs_seq_segment_bits_fops, sb);
 550                 proc_create_data("iostat_info", S_IRUGO, sbi->s_proc,
 551                                 &f2fs_seq_iostat_info_fops, sb);
 552         }
 553         return 0;
 554 }
 555
 556 void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
 557 {
 558         if (sbi->s_proc) {
 559                 remove_proc_entry("iostat_info", sbi->s_proc);
 560                 remove_proc_entry("segment_info", sbi->s_proc);
 561                 remove_proc_entry("segment_bits", sbi->s_proc);
 562                 remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
 563         }
 564         kobject_del(&sbi->s_kobj);
 565         kobject_put(&sbi->s_kobj);
 566         wait_for_completion(&sbi->s_kobj_unregister);
 567 }